Apparently Michigan's shooting budget is $131 M. Given this will be only Gotham's scenes, I imagine a budget of $250 -300 M is now guaranteed. Add in a P&R Budget that will approach $200 M (Avengers had a marketing budget of $175 M) and we're looking at a film that needs to make $800-900 M to see a penny of profit.

Avengers allegedly needed to clear $1.1 Billion to see profit after legit production costs ($300 M) P&A ($175 M) and Downey's % cut off the back end ($75 M).

BvS budget will atleast be more than a solo film. Well the last 2 DC solo films cost 250 million (TDKR) and 225 million (MOS) respectively, so I am thinking atleast 270 or maybe even 300 million might be the budget.

By the way, Avengers official budget is 220 million. Where are you getting 300 million from?